Tiny DNA rotor lets microscopes track gene transcription one base pair at a time
Scientists often describe life as a series of chemical reactions. Pallav Kosuri, Ph.D., describes life as movement. Chemical reactions are how you drive the movement of atoms, proteins, cells and bodies—without movement, there is no life.
This recent study published in Cell Reports Methods introduces a groundbreaking technique called ORBIT, developed by scientists at the Salk Institute. ORBIT stands for "ORIGAMI-Based Tracking of Interactions with DNA." This innovative method allows researchers to track the movement of a single RNA polymerase molecule as it transcribes DNA into RNA, achieving unprecedented resolution at the level of individual base pairs.
The key to ORBIT's success lies in the use of DNA origami, a technique that harnesses the unique structural properties of DNA to create custom nanostructures. By attaching a fluorescently labeled DNA origami rotor to the DNA strand, scientists can now visualize and measure the rotation of the DNA strand as RNA polymerase interacts with it.
Previously, it was challenging to observe molecular movements over extended periods due to the limitations of fluorescence microscopy. However, the ORBIT method overcomes this obstacle with a clever "dye-cycling" strategy that constantly replenishes fluorescent tags, extending the measurement time window from mere seconds to hours.
This breakthrough has the potential to provide critical insights into the mechanical aspects of gene transcription, shedding light on the intricate dance between DNA and RNA polymerase. By understanding the physical movements of these molecular machines, researchers can gain a deeper comprehension of how genes are read and transcribed, ultimately advancing our knowledge of cellular processes and the intricate machinery that sustains life.
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